灵鹊做题网1.What average force is required to stop an 1100kg car in 8s
来源：学生作业帮 编辑：灵鹊做题网作业帮 分类：英语作业 时间：2024/04/29 20:48:46
1.What average force is required to stop an 1100kg car in 8s if the car is traveling at 95km/h?
2.A
0.140kg baseball traveling 35.0m/s strikes the catcher's mitt,which,
in bringing the ball to rest,recoils backward 11.0cm.What was the
average force applied by the ball on the glove?
3.An
elevator( mass 4850kg) is to be designed so that the maximum
acceleration is 0.0680g.What are the maximum and minimum forces the
motor should exert on the supporting cable?
4.A person
stands on a bathroom scale in a motionless elevator.When the elevator
begins to move,the scale briefly reads only 0.75 of the person's
regular weight.Calculate the acceleration of the elevator,and find the
direction of acceleration.
5.A person jumps from the roof
of a house 3.9m high.When he strikes the ground below,he bends his
knees so that his torso decelerates over an approximate distance of
0.7m.If the mass of his torso(excluding legs) is 42kg,find(a)His
velocity just before his feet strike the ground,and (b)the average
force exerted on his torso by his legs during deceleration
2.A
0.140kg baseball traveling 35.0m/s strikes the catcher's mitt,which,
in bringing the ball to rest,recoils backward 11.0cm.What was the
average force applied by the ball on the glove?
3.An
elevator( mass 4850kg) is to be designed so that the maximum
acceleration is 0.0680g.What are the maximum and minimum forces the
motor should exert on the supporting cable?
4.A person
stands on a bathroom scale in a motionless elevator.When the elevator
begins to move,the scale briefly reads only 0.75 of the person's
regular weight.Calculate the acceleration of the elevator,and find the
direction of acceleration.
5.A person jumps from the roof
of a house 3.9m high.When he strikes the ground below,he bends his
knees so that his torso decelerates over an approximate distance of
0.7m.If the mass of his torso(excluding legs) is 42kg,find(a)His
velocity just before his feet strike the ground,and (b)the average
force exerted on his torso by his legs during deceleration
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